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Finding the Fourth Proportional to 253.63, 380.70 and 109.45

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Solution

The fourth proportional to 253.63, 380.70 and 109.45 is: 164.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.63 : 380.70 = 109.45 : x
  2. Step 2: Convert to fraction form
    253.63/380.70 = 109.45/x
  3. Step 3: Cross multiply
    253.63x = 380.70 × 109.45
  4. Step 4: Simplify right side
    253.63x = 41,667.62
  5. Step 5: Solve for x
    x = 41,667.62/253.63
  6. Step 6: Final answer
    x = 164.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.